High-efficiency propeller for aircraft

Abstract

An improved efficiency propeller for aircraft includes a blade structure mounted onto a propeller hub, a servo unit, and a cantilevered base. A distinctive feature of the disclosure is that the blade structure includes a main mast, which is mounted onto a propeller hub and forms the spine of the leading edge of the blade structure, and at least one secondary mast aligned with the main mast, and turning spacers with struts are mounted onto the main mast, and the struts are covered by lateral pieces of a skin module, and the overlapping and flexible lateral pieces of the skin module form a skin.

What is claimed is: 
     
       1. A propeller for aircraft, comprises a blade structure mounted onto a propeller hub, a servo unit, and a cantilevered base, wherein:
 the blade structure comprises a main mast, at least one secondary mast, and spacers, 
 wherein the main mast is mounted onto the propeller hub and forms a spine of a leading edge of the blade structure, and 
 the at least one secondary mast is mounted onto and aligned with the main mast, and the at least one secondary mast turns the spacers, 
 the spacers comprise struts and are mounted onto the main mast, and 
 the struts are covered by lateral pieces of a skin module, and 
 the lateral pieces of the skin module are overlapping and flexible, and form a skin, 
 wherein the at least one secondary mast is mounted onto a respective secondary mast base piece movable around an axis of rotation, which is either parallel to, or is the same as, the axis of rotation of the propeller hub, and the at least one secondary mast is connected to a tilting hub of spaced battens. 
 
     
     
       2. The propeller according to  claim 1 , wherein the struts embrace in a fork-like manner the at least one secondary mast, wherein the struts are turnable by the at least one secondary mast. 
     
     
       3. The propeller according to  claim 1 , wherein:
 the main mast is connected to the propeller hub through a hub of first spaced battens, 
 a gear fixed to the hub of first spaced battens is associated to the hub of the first spaced battens, and 
 a rack and a slider plate are associated to the gear fixed to the hub of the first spaced battens. 
 
     
     
       4. The propeller according to  claim 1 , wherein:
 the blade structure is fitted with a flexible blade tip element, and 
 the lateral pieces of the skin module are fitted with aerodynamic elements of aerodynamic profile trimming. 
 
     
     
       5. The propeller according to  claim 1 , wherein:
 an axis of the main mast is parallel to the leading edge of the blade structure, 
 the main mast and parts of the spacers mounted onto the main mast are covered by frontal pieces of the skin module, 
 the frontal pieces of the skin module are connected to the lateral pieces of the skin module, and 
 the lateral pieces of the skin module and the frontal pieces of the skin module form a modular unit of the skin. 
 
     
     
       6. The propeller according to  claim 2 , wherein:
 an axis of the main mast is parallel to the leading edge of the blade structure, 
 the main mast and parts of the spacers mounted onto the main mast are covered by frontal pieces of the skin module, 
 the frontal pieces of the skin module are connected to the lateral pieces of the skin module, and 
 the lateral pieces of the skin module and the frontal pieces of the skin module form a modular unit of the skin. 
 
     
     
       7. The propeller according to  claim 1 , wherein the further away from the propeller hub, the smaller a diameter of a cross-section of the main mast and the at least one secondary mast becomes. 
     
     
       8. The propeller according to  claim 2 , wherein the further away from the propeller hub, the smaller a diameter of a cross-section of the main mast and the at least one secondary mast becomes. 
     
     
       9. The propeller according to  claim 1 , wherein:
 the main mast is connected to the propeller hub through a hub of first spaced battens, 
 a gear fixed to the hub of second spaced battens is associated to the hub of the first spaced battens, and 
 a rack and a slider plate are associated to the gear fixed to the hub of the first spaced battens.